Secondary battery.



- county of Middlesex, En land, have invented LornAR FIEDLER, or STOKEQNEWINGTON, ENGLAND.

SECONDARY BATTERY.

Specification of Letters Patent.

Patented Au 25, 1908.

Application filed February 25, 1907. Serial No. 359,257.

To all when"; it may concern:

Be it known that I, LOTHAR Futures, of 22%- Oazeiiove road, Stoke Newington, 1n the certain new and use Improvements in Secondary Batteries; and I do hereby declare the following to be a full, clear, and'exact description of the invention,- such as will enable others skilled in the art to which it ap ertains to make and use the same.

his invention relates toimprovements in secondary batteries and consists in the production of a lead paste which, without containin in admixture therewith, any foreign body, as, when first prepared, the consist-' e'ncy of a soft adherent mass adapted to be molded with facility so as to completely occup the interstices of a lead frame or grid and t ereafter, in a short time, to become very hard and, after further treatment as will be presently described, to constitute a very durable, finely porous, highly conductive plate for a secondary battery, capable of being discharged to an unusual degree without detriment and immune tothe deteriorating influence of the sulfuric acid elec' trolyte, though left uncharged for a considerable time. I p

The invention consists in producinga cementitious plastic mass by the addition of lead oxid to a compound solution derived by mixing lead acetate with phenol, (carbolic acid). The addition of the solution to the lead oxid results. in the generation of heat and the product which at first is a moldable' paste quickly sets as a'hard concrete. The phenomena are much like those which attend the mixing of water with plaster of paris and the hardening is probably due to the same kind of cause, namely the formation of a crystalline molecular structure.

The process is ap lic'able to the roduction of a positive-pole p ate as well as t e production of a negative-pole plate the difference consisting in the nature of the lead oxid which'it is preferable to use.

' In carrying out the operation I take three parts of a 10% solution of lead acetate and add to it one part of a 10% solution of phenol,

fcarbolic acid), with the result that I obtaina liquid compound known as leadphenylatcacetate.

To produce a plate which, on the discharge of the battery is intended to be a positive pole plate, I now addto the above described liquid as much powdered minium, as will produce a coherent plastic mass. On the addition of the minium a molecular or chemical reaction will take place resulting in the production of heat, and the formation of a coherent paste of lead compounds. The paste thus formed should now be worked in, to

completely fill the interstices of the grid in a" com act manner and afterwards subjected to arti 'cial heat which will quickly render the paste'very' hard and by the evaporation of the acetic acid cause it to be finely porous. The plate is then washed to remove the remnants of free acetic acid;

The lead peroxid 1 produced by electrolytic oxidation of the paste thus prepared will be exceedingly hard and finely porous and, on account of the absence of binding substances of-a non-conductive character, it is an excellent conductor of electricity.

To produce in a similar manner, a plate to act on dischargeas a negative-pole-plate, litharge,'instead of minium, is added to the solution of lead-phenylate-aeetate or, instead of. litharge sim lo, a mixture consisting of about two-third; litharge and one-third minium. The same kind of chemical reaction will take place resulting in the production of heat and the formation of a paste which will be plastic and adherent. By electrolytical reduetion such a plate will become a tough compact porous sheet of metal adapted throughout its mass to amalgamate with'mercury.

I claim.

1. A plate for secondary batteries comprising a grid, an adherent paste, said paste consisting of lead oxid mixed with a solution which results from the addition of lead acctate to phenol.

2. A plate for secondary batteries com- 'prising-a grid having interstices therein, said porous nature inserted in the interstices with an acrid solution-of lead phenylate-acewhile in soft, pasty condition due to the miX- tate. a

ture of lead phenylate-acetate with lead oxid. In testimony whereof I have hereunto set 3. A negative pole plate comprising a grid, my hand in' the presence of two subscribing 5 and an aclilherent piaste compliisiingillillzlhargle witnesses.

mixe wit an acri so utiono ea p eny ate acetate v LOTHAR FIEDLER.

4. A negative pole plate for secondary bat- Witnesses: teries comprising a grid, an adherent paste "FREDERICK W. LANE, 10 composed of litharge, and minium mixed 1 H. D. JAMESON. 

